The contemporary hilton istanbul bomonti hotel conference center is conveniently set in sisli one of istanbuls most cosmopolitan areas sisli also includes the mecidiyekoy and gayrettepe business districts and nisantasi an upscale district with luxury stores and chic restaurants visit taksim square considered to be the heart of modern istanbul marvel at historical buildings including galata tower and the blue mosque haggle for souvenirs at the grand bazaar in the old town area or shop i